RDS (Radio Data System) links FM transmitters into a network. An FM transmitter in such a network sends information that gives an RDS radio the following functions:
If a required programme type is located the radio can switch stations interrupting the audio source currently in use. For example, if the CD player is in use, it is paused. The interrupting transmission is played back at a preset volume. The radio returns to the previous audio source and volume when the set programme type is no longer broadcast.
The programme functions alarm, traffic information (TP) and programme types (PTY) interrupt one another in order of priority, where alarm has the highest priority and programme types has the lowest. Press OK/MENU to return to the interrupted audio source and still listen to the message. Press EXIT to cancel the message and return to the interrupted audio source.